// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef GIN_MODULES_MODULE_RUNNER_DELEGATE_H_
#define GIN_MODULES_MODULE_RUNNER_DELEGATE_H_

#include <map>

#include "base/callback.h"
#include "base/compiler_specific.h"
#include "gin/gin_export.h"
#include "gin/modules/file_module_provider.h"
#include "gin/shell_runner.h"
#include "v8/include/v8.h"

namespace gin {

typedef v8::Local<v8::Value> (*ModuleGetter)(v8::Isolate* isolate);
typedef base::Callback<v8::Local<v8::Value>(v8::Isolate*)> ModuleGetterCallback;

// Emebedders that use AMD modules will probably want to use a RunnerDelegate
// that inherits from ModuleRunnerDelegate. ModuleRunnerDelegate lets embedders
// register built-in modules and routes module requests to FileModuleProvider.
class GIN_EXPORT ModuleRunnerDelegate : public ShellRunnerDelegate {
public:
    explicit ModuleRunnerDelegate(
        const std::vector<base::FilePath>& search_paths);
    ~ModuleRunnerDelegate() override;

    void AddBuiltinModule(const std::string& id, ModuleGetter getter);
    void AddBuiltinModule(const std::string& id,
        const ModuleGetterCallback& getter);

protected:
    void AttemptToLoadMoreModules(Runner* runner);

private:
    typedef std::map<std::string, ModuleGetterCallback> BuiltinModuleMap;

    // From ShellRunnerDelegate:
    v8::Local<v8::ObjectTemplate> GetGlobalTemplate(
        ShellRunner* runner,
        v8::Isolate* isolate) override;
    void DidCreateContext(ShellRunner* runner) override;
    void DidRunScript(ShellRunner* runner) override;

    BuiltinModuleMap builtin_modules_;
    FileModuleProvider module_provider_;

    DISALLOW_COPY_AND_ASSIGN(ModuleRunnerDelegate);
};

} // namespace gin

#endif // GIN_MODULES_MODULE_RUNNER_DELEGATE_H_
